Multiband Hysteresis Current Controller for Three Level BLDC Motor Drive

As the transportation sector is promoting electric vehicle technology, the demand for high torque machine is increasing. For high performance the electrical machine drives needs to be operated above 400V DC bus. At high voltage the low inductance property of brushless DC (BLDC) motor can cause high torque ripple which is unsuitable for drive operation. In this paper, a new multiband hysteresis current controller (MHCC) for minimizing the torque ripple in a three level brushless DC motor drive is presented. Hysteresis controller are widely used for their good dynamic response, ease of implementation and overload current protection. Hysteresis current control is well established for two level inverters. In this paper, a three level inverter with MHCC is implemented for improving the current tracking and to reduce the torque ripple. The simulation results thus obtained in MATLAB/Simulink environment is encouraging. In depth analysis to evaluate the performance of the proposed current control strategy is also presented.